I am trying to create my first android+html 5 application..
My Activity code is :
import android.os.Bundle;
import android.app.Activity;
import android.webkit.WebView;
public class MainActivity extends Activity {
WebView webView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
webView = new WebView(this);
String summary = "<html><body>HTML 5 Test</body></html>";
webView = (WebView)findViewById(R.id.webView);
webView.loadData( summary, "text/html; character=UTF-8", null);
setContentView(webView);
}
}
When I run above code, It gives Null Pointer Exception…
09-08 09:27:21.393: D/AndroidRuntime(562): Shutting down VM
09-08 09:27:21.393: W/dalvikvm(562): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-08 09:27:21.530: E/AndroidRuntime(562): FATAL EXCEPTION: main
09-08 09:27:21.530: E/AndroidRuntime(562): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rightquery.test/com.rightquery.test.MainActivity}: java.lang.NullPointerException
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.os.Handler.dispatchMessage(Handler.java:99)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.os.Looper.loop(Looper.java:137)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-08 09:27:21.530: E/AndroidRuntime(562): at java.lang.reflect.Method.invokeNative(Native Method)
09-08 09:27:21.530: E/AndroidRuntime(562): at java.lang.reflect.Method.invoke(Method.java:511)
09-08 09:27:21.530: E/AndroidRuntime(562): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-08 09:27:21.530: E/AndroidRuntime(562): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-08 09:27:21.530: E/AndroidRuntime(562): at dalvik.system.NativeStart.main(Native Method)
09-08 09:27:21.530: E/AndroidRuntime(562): Caused by: java.lang.NullPointerException
09-08 09:27:21.530: E/AndroidRuntime(562): at com.rightquery.test.MainActivity.onCreate(MainActivity.java:19)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.Activity.performCreate(Activity.java:4465)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-08 09:27:21.530: E/AndroidRuntime(562): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
09-08 09:27:21.530: E/AndroidRuntime(562): ... 11 more
EDIT: Layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<WebView
android:id="@+id/webView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="2dp"
android:layout_marginLeft="2dp" />
</RelativeLayout>
What is wrong ?
The Solution:
import android.os.Bundle;
import android.app.Activity;
import android.webkit.WebView;
public class MainActivity extends Activity {
WebView webView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
webView = new WebView(this);
setContentView(R.layout.main);
String summary = "<html><body>HTML 5 Test</body></html>";
webView = new WebView(this);
webView.loadData( summary, "text/html; character=UTF-8", null);
setContentView(webView);
}
}
You need to do
setContentView(R.layout.youView);before calling